A Computerized Method for the Measurement of Conspicuity

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Abstract
A computer program was designed for comparing the conspicuity of an object of interest portrayed on film-based and photoelectronic images. To test this program, nephrograms generated by exposing matched film tomograms and digital images were evaluated of rabbit kidneys following contrast administration. Their conspicuity, a measure of how well an object can be distinguished from its surround, was evaluated by a computer program which automatically traced a concentric and equal area of surrounding background around operator-defined nephrograms. Computerized evaluation of these areas provides the formula elements (mean object and background density and variance values and the number of pixels) from which conspicuity is automatically calculated. Nephrogram conspicuity was greatest for digital subtraction images. This approach is useful for comparing film and digital techniques.

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